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authorYanmin Zhang <yanmin_zhang@linux.intel.com>2011-10-31 17:11:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-31 17:30:53 -0700
commit0eca6b7c78fd997e02bd9850e608102382b7822e (patch)
tree39dd9b7b952da5560f4addb3df3e1f907b345d2e
parent73efc0394e148d0e15583e13712637831f926720 (diff)
printk: add module parameter ignore_loglevel to control ignore_loglevel
We are enabling some power features on medfield. To test suspend-2-RAM conveniently, we need turn on/off ignore_loglevel frequently without rebooting. Add a module parameter, so users can change it by: /sys/module/printk/parameters/ignore_loglevel Signed-off-by: Yanmin Zhang <yanmin.zhang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/kernel-parameters.txt3
-rw-r--r--kernel/printk.c3
2 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 27e0488d54d..106efe1e2ba 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -973,6 +973,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
ignore_loglevel [KNL]
Ignore loglevel setting - this will print /all/
kernel messages to the console. Useful for debugging.
+ We also add it as printk module parameter, so users
+ could change it dynamically, usually by
+ /sys/module/printk/parameters/ignore_loglevel.
ihash_entries= [KNL]
Set number of hash buckets for inode cache.
diff --git a/kernel/printk.c b/kernel/printk.c
index b7da18391c3..e62f949ec14 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -532,6 +532,9 @@ static int __init ignore_loglevel_setup(char *str)
}
early_param("ignore_loglevel", ignore_loglevel_setup);
+module_param_named(ignore_loglevel, ignore_loglevel, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to"
+ "print all kernel messages to the console.");
/*
* Write out chars from start to end - 1 inclusive